// ------------------------------------------------------------------------------
// 
// Copyright (c) 2007-2008 Swampware, Inc.
// 
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
// 
// ------------------------------------------------------------------------------
using System;

namespace Water.Commands
{
	/// <summary>
	/// Summary description for VarCommand.
	/// </summary>
	public class VarCommand : Water.Commands.Command
	{

		public VarCommand()
		{
		}

		public override string Name
		{
			get { return "var"; }
		}

		public override object Evaluate(Water.List expressions, Water.Environment environment, Water.Evaluator evaluator)
		{
			if(expressions.Count != 2)
			{
				throw new Water.Commands.InvalidArgumentsException(this.Name, expressions);
			}


			if(!(expressions[0] is Identifier))
			{
				throw new Water.Commands.InvalidArgumentsException(this.Name, expressions);
			}
			string name = ((Identifier)expressions[0]).Value;

			object value = evaluator.Evaluate(expressions[1], environment);



			environment.Push(name, value);



			Water.Dictionary frame = (Water.Dictionary)environment.Peek("_Frame");
			frame.Add(name, value);



			return null;
		}

	}
}
